Minimum distance estimation in linear regression with strong mixing errors

Abstract

Minimum distance estimation on the linear regression model with independent errors is known to yield an efficient and robust estimator. We extend the method to the model with strong mixing errors and obtain an estimator of the vector of the regression parameters. The goal of this article is to demonstrate the proposed estimator still retains efficiency and robustness. To that end, this article investigates asymptotic distributional properties of the proposed estimator and compares it with other estimators. The efficiency and the robustness of the proposed estimator are empirically shown, and its superiority over the other estimators is established.     

The Mother-in-Law Mystique: A Tale of Conflict,Criticism and Resistance

While women have been described in various disciplines as the kin keepers of family relationships, empirical data show that the greatest rivalry in newly constructed heterosexual families exists between two women: the mother-in-law and the daughter-in-law. Numerous rituals are employed across cultures in order to ease the expected tension between these two rival women. Yet, the topic seems to have been overlooked by feminist and family therapy research alike. Inspired by Bowen's (1978) concept of differentiation of self and Linn's (1998) and Gilligan's (Linn & Gilligan, 1990) ideas of the resisting self, the present study examines these female rivals as moral critics in the war zone of the family. The study sample consists of 14 mothers-in-law, daughters-in-law, and sons/husbands, belonging to five Israeli families of diverse cultural origin. Gilligan's Listening Guide was used to assess how participants saw the dilemmas of their situation, adopted a critical distance, and formed an authoritative moral voice.     

The social distance of Poles to other minorities: a study of four cities in Germany and Britain

This contribution investigates the social distance of immigrants from Poland in four Western European cities – London, Birmingham, Berlin and Munich – particularly Polish immigrants’ distance towards members of ethnic, religious and sexual minorities in their various social roles. Presenting unique data from the first wave of a longitudinal qualitative study, we first discuss the differential levels of social distance that Polish immigrants place between themselves and members of minority groups in each city. We find that respondents’ socio-demographic characteristics impact their social distance, but their education and occupation may have less of an effect than their place of origin in Poland or current place of residence and work. Moreover, these factors work differentially across the four cities. After analysing social distance with respect to three dimensions of difference – ethnicity, religion and sexuality – we find several different social-distancing mechanisms. Ultimately, we argue that social science needs to consider regional and local contexts in which social attitudes towards minorities are acquired and exercised. Similarly, we need to reflect on the group’s presumed homogeneity and on the unifying visions of the ‘host society’ as a site of migrants’ incorporation.     

Bayes prediction of Poisson regression superpopulation mean with a non gamma prior

We consider Khamis' (1960) Laguerre expansion with gamma weight function as a class of “near-gamma” priors (K-prior) to obtain the Bayes predictor of a finite population mean under the Poisson regression superpopulation model using Zellner's balanced loss function (BLF). Kullback–Leibler (K-L) distance between gamma and some K-priors is tabulated to examine the quantitative prior robustness. Some numerical investigations are also conducted to illustrate the effects of a change in skewness and/or kurtosis on the Bayes predictor and the corresponding minimal Bayes predictive expected loss (MBPEL). Loss robustness with respect to the class of BLFs is also examined in terms of relative savings loss (RSL).     

Remarks on the L1 distance in statistical data analysis

We propose the L₁ distance between the distribution of a binned data sample and a probability distribution from which it is hypothetically drawn as a statistic for testing agreement between the data and a model. We study the distribution of this distance for N-element samples drawn from k bins of equal probability and derive asymptotic formulae for the mean and dispersion of L₁ in the large-N limit. We argue that the L₁ distance is asymptotically normally distributed, with the mean and dispersion being accurately reproduced by asymptotic formulae even for moderately large values of N and k.     

面板数据加权聚类分析方法研究

在面板数据聚类分析方法的研究中,基于面板数据兼具截面维度和时间维度的特征,对欧氏距离函数进行了改进,在聚类过程中考虑指标权重与时间权重,提出了适用于面板数据聚类分析的"加权距离函数"以及相应的Ward.D聚类方法。首先定义了考虑指标绝对值、邻近时点增长率以及波动变异程度的欧氏距离函数;然后,将指标权重与时间权重通过线性模型集结成综合加权距离,最终实现面板数据的加权聚类过程。实证分析结果显示,考虑指标权重与时间权重的面板数据加权聚类分析方法具有更好的分辨能力,能提高样本聚类的准确性。     

An assessment of work-integrated learning for public relations in an open distance learning context

Education institutions are increasingly required to ensure the employability of their students through quality and relevant educational programmes. Organisational change, in response to current global challenges, is not a new occurrence and impacts on all levels and functions of the organisation. This is of particular relevance to the field of public relations as an organisational function and it is therefore essential to match theoretical learning with practice, to ensure that the function operates effectively in the broader organisational context. It, moreover, re-establishes the need for the continuous assessment of educational programmes to ensure competent and employable public relations students.     

Spatial distance and mobile business social network density

Following the increasing adoption of mobile communication, scholars have shown interest in the role of place on the structure of mobile social networks. The purpose of this study is to investigate the association between spatial distance and the closure and diversity of businesses mobile social networks. We used a database that aggregates actual mobile communication patterns of business users of a large Israeli cell phone company (n?= 16,199). Our findings, among a large sample of businesses, provide support for the place and mobile communication perspective. The results reveal a negative association between spatial distance and mobile business communication networks. As spatial distance between business network members increases, business social ties through mobile communication decreases. Furthermore, the results also revealed a negative association between spatial distance and mobile network density. As the spatial distance between business users increases, the density of the mobile communication network diminishes. Physical proximity promotes the development of dense business networks. The implications of the findings are discussed.     

The spatial structure of transnational human activity

Starting from conflictive predictions of hitherto disconnected debates in the natural and social sciences, this article examines the spatial structure of transnational human activity (THA) worldwide (a) across eight types of mobility and communication and (b) in its development over time. It is shown that the spatial structure of THA is similar to that of animal displacements and local-scale human motion in that it can be approximated by Lévy flights with heavy tails that obey power laws. Scaling exponent and power-law fit differ by type of THA, being highest in refuge-seeking and tourism and lowest in student exchange. Variance in the availability of resources and opportunities for satisfying associated needs appears to explain these differences. Over time (1960–2010), the Lévy-flight pattern remains intact and remarkably stable, contradicting the popular notion that socio-technological trends lead to a “death of distance.” Humans have not become more “global” over time, they rather became more mobile in general, i.e. they move and communicate more at all distances. Hence, it would be more adequate to speak of “mobilization” than of “globalization.” Longitudinal change occurs only in some types of THA and predominantly at short distances, indicating regional rather than global shifts.     

All the way from … authenticity and distance in world music production

World music and the narratives it produces are at the very centre of a formerly transnational production and consumption process. However, the shortened distance between the sites of production and consumption of this good, brought on by migration and greater participation, has created a dilemma for the UK-based artists who perform it: how to maintain authenticity without the added value of ‘distance’. Therefore, the aim of this article is to examine the ways in which musicians and other participants attempt to overcome this problem and in doing so (re)-construct particular aspects of their identity. Rather than being just another critique on authenticity, this article uses distance as an organizing concept in understanding the challenges facing world music production in the UK.